First: I have to stress that someone should not actually do this, because it will break official firmware from working on the Dash!!! Do NOT do this. If you do not understand what you are doing, DO NOT do this! If you understand what you are doing, still, DO NOT do this!
Second: AT+CREG=0 and AT+CGREG=0 will disable those URCs. You can still poll using AT+CREG? and AT+CGREG? to check status; however, I strongly recommend implementing something that can handle both URCs and solicited responses (see our firmware source code for examples).
Hope that helps
THIS IS NOT A SUPPORTED OPERATION